Upbeat Signals From Fed
Invigorate Wary Investors

One day after accounting worries sparked a broad stock selloff, investors regained some of their confidence, bidding stocks up again amid upbeat signals from the Federal Reserve.

The Dow Jones Industrial Average and the Standard & Poor's 500-stock index both registered their biggest point and percentage gains of the year. Nearly two billion shares changed hands on the New York Stock Exchange, the most since Sept. 21, shortly after...